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WO1997032929A1 - Films de polylactide - Google Patents

Films de polylactide Download PDF

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Publication number
WO1997032929A1
WO1997032929A1 PCT/FI1997/000143 FI9700143W WO9732929A1 WO 1997032929 A1 WO1997032929 A1 WO 1997032929A1 FI 9700143 W FI9700143 W FI 9700143W WO 9732929 A1 WO9732929 A1 WO 9732929A1
Authority
WO
WIPO (PCT)
Prior art keywords
polylactide
films
plasticizer
strength
films according
Prior art date
Application number
PCT/FI1997/000143
Other languages
English (en)
Inventor
Elina Hiltunen
Maria Skog
Johan-Fredrik Selin
Original Assignee
Neste Oy
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Neste Oy filed Critical Neste Oy
Priority to US09/125,867 priority Critical patent/US6117928A/en
Priority to DK97906199T priority patent/DK0885261T3/da
Priority to EP97906199A priority patent/EP0885261B1/fr
Priority to AU20970/97A priority patent/AU2097097A/en
Priority to DE69709320T priority patent/DE69709320T2/de
Priority to JP9531492A priority patent/JP2000506204A/ja
Priority to AT97906199T priority patent/ATE211157T1/de
Publication of WO1997032929A1 publication Critical patent/WO1997032929A1/fr

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
    • C08J5/18—Manufacture of films or sheets
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K5/00—Use of organic ingredients
    • C08K5/04—Oxygen-containing compounds
    • C08K5/10—Esters; Ether-esters
    • C08K5/101—Esters; Ether-esters of monocarboxylic acids
    • C08K5/103—Esters; Ether-esters of monocarboxylic acids with polyalcohols
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L67/00—Compositions of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Compositions of derivatives of such polymers
    • C08L67/04—Polyesters derived from hydroxycarboxylic acids, e.g. lactones
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2367/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
    • C08J2367/04—Polyesters derived from hydroxy carboxylic acids, e.g. lactones

Definitions

  • the invention relates to polylactide films with improved mechanical properties.
  • the invention relates in particular to the use of plasticizers to improve mechanical properties.
  • Polylactide i.e. polylactic acid, which is usually prepared from lactic acid dimer, i.e. lactide, has already for years been used for medical purposes, for example in the manu- facture of surgical sutures, for degradable bone nails, and for controlled release of drugs.
  • the use of polymers for packaging materials and for other bulk products has so far been limited by the high price of polymers and their susceptibility to breaking down during technical processing. It has not been economically profitable to produce and treat in a manner intended for medical applications a polymer intended for bulk products.
  • biodegradable polymers i.e. biopolymers
  • biopolymers have greatly inc ⁇ reased, and many companies have made efforts to launch on the market packaging materials, hygiene products, sacks and films for agricultural purposes, and sacks for waste.
  • various films have gained importance.
  • Polylactides, or condensation polymers which are based on lactic acid, are for many reasons a very attractive group of biopolymers. Their principal degradation product, lactic acid, is a product common in nature, it is not toxic and is used widely in the food and pharmaceutical industries.
  • a high molecular weight polymer can be produced by ring- opening polymerization from lactic acid dimer, lactide. Lactic acid is optically active, and thus its dimer appears in four different forms: L,L-lactide; D,D-lactide; L,D-lactide (mesolactide); and a racemic mixture of L,L- and D,D-lactides.
  • polymers By polymerizing these either as pure compounds or at different blend proportions, polymers are obtained which have different stereochemical structures affecting their resilience and crystallinity and, consequently, also their mechanical and thermal properties.
  • the obtained polymers are usually hard and optically clear, but not as such usable, owing to certain problems.
  • polylactide Upon forming, polylactide is in equilibrium with its monomer, lactide. This has someti- mes been deemed to be advantageous, since monomers and oligomers may act as plastici ⁇ zers of the polymer, but it also leads to rapid hydrolysis and causes problems of adhesion in the processing of the polymer. Furthermore, the presence of the monomer lowers thermal stability during melt processing. In general the residual lactide must be removed from the polymer. An acceptable lactide content is below 2 %, preferably below 1 % . Various removal methods, such as evaporation, have been disclosed.
  • the breaking down of polymers during processing can be reduced by the removal of the residual lactide, the maintenance of the water content at a low level (below 200 ppm) or by the addition of commercial stabilizers (WO 94/07941, Cargill).
  • an advantageous method is to mix certain peroxides with the polymer, whereby the melt strength of the polymer will be sufficient for film blowing (FI945964, FI945264, Neste).
  • Polylactide has excellent optical properties and a high tensile strength, but it is rigid and brittle, and its elongation values are low, as are its tearing strength and bursting strength (dart-drop).
  • Battelle's patent publication WO 92/04493 mentions leaving monomers and oligomers in the polymer for plasticizing purposes.
  • Cargill, WO 94/07941 has used various commer ⁇ cial plasticizers, in particular Citroflex plasticizers manufactured by Morflex, in order to lower the glass transition temperature. However, the results have been modest.
  • bursting strength, elongation and tearing strength are especially important properties.
  • shopping bags must not break even when sharp corners impinge against the film.
  • a weight below 20 g which is the lowest weight in the standard test, will burst the film.
  • the bursting strength is up to approx. 10-30 g/ ⁇ m.
  • Bursting strength values of 3-10 g/ ⁇ m are sufficient in films subjected to smaller stress, such as bread bags and other bags intended for food packaging, but are not sufficient for, for example shopping bags.
  • the polylactide used in the invention can be made from L-, D- or D,L-lactide, or blends thereof, by any polymerization process. Copolymers or polymer blends may also used, but this is by no means necessary for the functioning of the invention. The use of poly-L- lactide is especially advantageous.
  • the weight-average molecular weight (M w ) of the polymer according to the invention is approx. 20000 - 400000, preferably 40000 -
  • M n number-average molecular weight
  • Polylactide films can effectively be tailored according to the intended use by the selection of a suitable plasticizer and, when needed, a filler.
  • Suitable plasticizers include many commonly available commercial plasticizers, such as mono- and polycarboxylic acid esters, polymeric polyesters, polyalkyl ethers, and glycerol and glycol esters. Blends of various plasticizers can also be used.
  • the suitable plasticizer amounts are 10-30 % by weight, preferably 15-20 % by weight.
  • Glycerol esters such as glycerol triacetate and glycerol tripropionate are especially suitable plasticizers. Also various polymeric plasticizers such as adipate derivatives are suitable.
  • the fillers used may be any conventional inorganic or organic fillers, such as calcium carbonate, kaolin, mica, talc, silica and zeolite.
  • the suitable filler amount may be 0.1- 10 % by weight, depending on the product.
  • the purpose of the filler is to serve as an adhesion inhibitor and thereby facilitate, for example, the splitting of a tubular film.
  • Plasticizers and, when so desired, fillers and other additives, are mixed with the polylacti ⁇ de, before film blowing, by a conventional melt mixing method, for example in a double- or single-screw extruder or in a batch mixer.
  • Peroxides acting as stabilizers are characterized by a short half-life, preferably below 10 s, but most prefera ⁇ bly below 5 s.
  • Examples which can be given of suitable peroxides include dilauroyl peroxide (half-life at 200 °C 0.057 s), tert-butylperoxydiethylacetate (0.452 s), t-butylpe- roxy-2-ethylhexanoate (0.278 s), tert-butylperoxyisobutyrate (0.463 s) and tert- butylperoxyacetate (3.9 s), tert-butylperoxybenzoate (4.47 s) and dibenzoylperoxide (0.742 s).
  • the amount of peroxide to be used is approx. 0.05-3 % by weight. The required amount depends on the peroxide compound and above all on the desired end product.
  • the stabilized polymer material can be used for manufacturing films by the blowing method, or the polymer can, of course, be used for manufacturing cast films or sheets, which usually does not set so high requirements on the polymer.
  • the uses of the films include conventional uses of films, in particular those in which the aim is to minimize the amounts of waste and to process waste by, for example, compos- ting. This involves various packaging materials, such as pouches, films, shopping bags and hygiene products, such as diapers and various agricultural films.
  • Sheets made from polylactide can be used as various packaging trays or covers or, for example, in agricultural use as cultivation trays or pots.
  • the polylactide used in the experiments was made by ring-opening polymerization from L-lactide with the aid of a stannium octoate catalyst, the molecular weight M w was approx. 100000-160000.
  • the polylactide was manufactured by Neste Oy.
  • the glass transition temperatures were determined using DSC (Differential Scanning Calorimetry) equipment. In the tensile strength at break and elongation at break tests, the lower speed was used for the more brittle polymers.
  • PEG Polyethylene glycol
  • FDA food contact
  • Triacetin manufactured by Bayer is glycerol triacetate, and it was used in this example as a plasticizer for polylactide. Triacetin has also been accepted for food contact. Polylactide blends modified with Triacetin plasticizer were prepared and tested. The blends and films were made as described above. The plasticizer amounts and the minerals used, as well as the test results, are shown in Table 3.
  • Triacetin Filler Amounts of Elongation Tensile Tearing strength wt. % fillers, wt. % at break strength at (Trousers tear)
  • MD/TD MD/TD
  • the bursting strengths obtained were very good, even better than for typical film materials polyethylene and polypropylene. According to the reference tests, the bursting strengths for commercial film materials were:
  • HDPE Polyethylene
  • LDPE 60 g (25 ⁇ m), i.e. 2.4 g/ ⁇ m
  • PP 128 g (40 ⁇ m), i.e. 3.2 g/ ⁇ m.
  • Example 3 Films of Example 3 were investigated, which had been made of a polylactide with which there had been blended 16 % Triacetin plasticizer, 2 % talc, and 1.5 % titanium dioxide (white color). The films were tested above and below the glass transition temperature and at room temperature. The results are shown in Table 4. Table 4. Testing of plasticized PLLA films at different temperatures
  • Polymeric plasticizers were tested, their advantage being their FDA acceptance for packaging and adhesive application.
  • the products used in the tests were Santicizer# products manufactured by Monsanto, which are based on polymeric adipates except
  • Santicizer 160 which is benzyl butyl phthalate.
  • the blending and film making were carried out as previously. The results are shown in Table 6.

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Manufacturing & Machinery (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Manufacture Of Macromolecular Shaped Articles (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Biological Depolymerization Polymers (AREA)
  • Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
  • Macromolecular Compounds Obtained By Forming Nitrogen-Containing Linkages In General (AREA)

Abstract

L'invention se rapporte à des films de polylactide dont les propriétés mécaniques, notamment la résistance à l'éclatement, à l'allongement et à la rupture, ont été améliorées par ajout de certains plastifiants au polymère. Ces plastifiants sont de préférence des glycérols esters.
PCT/FI1997/000143 1996-03-05 1997-03-04 Films de polylactide WO1997032929A1 (fr)

Priority Applications (7)

Application Number Priority Date Filing Date Title
US09/125,867 US6117928A (en) 1996-03-05 1997-03-04 Polylactide films
DK97906199T DK0885261T3 (da) 1996-03-05 1997-03-04 Polylactidfilm
EP97906199A EP0885261B1 (fr) 1996-03-05 1997-03-04 Films de polylactide
AU20970/97A AU2097097A (en) 1996-03-05 1997-03-04 Polylactide films
DE69709320T DE69709320T2 (de) 1996-03-05 1997-03-04 Polylaktidfilme
JP9531492A JP2000506204A (ja) 1996-03-05 1997-03-04 ポリラクチドフィルム
AT97906199T ATE211157T1 (de) 1996-03-05 1997-03-04 Polylaktidfilme

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI961022A FI105040B (fi) 1996-03-05 1996-03-05 Polylaktidikalvot
FI961022 1996-03-05

Publications (1)

Publication Number Publication Date
WO1997032929A1 true WO1997032929A1 (fr) 1997-09-12

Family

ID=8545587

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FI1997/000143 WO1997032929A1 (fr) 1996-03-05 1997-03-04 Films de polylactide

Country Status (10)

Country Link
US (1) US6117928A (fr)
EP (1) EP0885261B1 (fr)
JP (1) JP2000506204A (fr)
AT (1) ATE211157T1 (fr)
AU (1) AU2097097A (fr)
DE (1) DE69709320T2 (fr)
DK (1) DK0885261T3 (fr)
ES (1) ES2170364T3 (fr)
FI (1) FI105040B (fr)
WO (1) WO1997032929A1 (fr)

Cited By (4)

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WO1999023161A3 (fr) * 1997-10-31 1999-08-19 Monsanto Co Melanges polymeres renfermant des polyhydroxyalcanoates et compositions presentant une bonne retention d'elongation
EP1029890A3 (fr) * 1999-02-18 2001-09-12 Mitsui Chemicals, Inc. Composition de polyester aliphatique et feuille étirée obtenue à partir de celle-ci
WO2011082052A1 (fr) * 2009-12-28 2011-07-07 3M Innovative Properties Company Polylactide plastifié
US8846202B2 (en) 2007-08-14 2014-09-30 Huhtamaki Films Germany Gmbh & Co. Kg Film arrangement

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US20020128344A1 (en) * 2000-12-07 2002-09-12 Yuko Fujihira Biodegradable resin material and method for producing the same
DE10127314A1 (de) * 2001-06-06 2002-12-19 Trespaphan Gmbh Biologisch abbaubare biaxial verstreckte Folie mit kontrolliertem Weiterreißverhalten
US6645618B2 (en) 2001-06-15 2003-11-11 3M Innovative Properties Company Aliphatic polyester microfibers, microfibrillated articles and use thereof
JP4812973B2 (ja) * 2001-06-18 2011-11-09 三井化学株式会社 生分解性結束材
CN1628151A (zh) * 2002-02-05 2005-06-15 三井化学株式会社 生物降解性树脂组合物及其成型体
JP4511099B2 (ja) * 2002-02-13 2010-07-28 三菱樹脂株式会社 乳酸系樹脂組成物とそのシート状物、及び袋状製品
US20090123682A1 (en) * 2007-11-08 2009-05-14 Weder Donald E Floral packaging formed of renewable or biodegradable polymer materials
US6890649B2 (en) * 2002-04-26 2005-05-10 3M Innovative Properties Company Aliphatic polyester microfibers, microfibrillated articles and use thereof
FR2862310B1 (fr) * 2003-11-17 2008-04-25 Roquette Freres Utilisation d'une dispersion aqueuse d'au moins un polymere biodegradable contenant au moins un agent stabilisant pour la preparation d'une composition filmogene aqueuse
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EP0683207A2 (fr) * 1994-05-19 1995-11-22 Mitsui Toatsu Chemicals, Incorporated Composition de polymère de L-acide lactique, produit moulé et feuille

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999023161A3 (fr) * 1997-10-31 1999-08-19 Monsanto Co Melanges polymeres renfermant des polyhydroxyalcanoates et compositions presentant une bonne retention d'elongation
US6191203B1 (en) 1997-10-31 2001-02-20 Monsanto Company Polymer blends containing polyhydroxyalkanoates and compositions with good retention of elongation
US6841603B1 (en) 1997-10-31 2005-01-11 Metabolix, Inc. Polymer blends containing polyhydroxyalkanoates and compositions with good retention of elongation
EP1029890A3 (fr) * 1999-02-18 2001-09-12 Mitsui Chemicals, Inc. Composition de polyester aliphatique et feuille étirée obtenue à partir de celle-ci
US8846202B2 (en) 2007-08-14 2014-09-30 Huhtamaki Films Germany Gmbh & Co. Kg Film arrangement
WO2011082052A1 (fr) * 2009-12-28 2011-07-07 3M Innovative Properties Company Polylactide plastifié

Also Published As

Publication number Publication date
FI961022A0 (fi) 1996-03-05
US6117928A (en) 2000-09-12
DK0885261T3 (da) 2002-03-25
DE69709320D1 (de) 2002-01-31
ES2170364T3 (es) 2002-08-01
EP0885261A1 (fr) 1998-12-23
FI961022L (fi) 1997-09-06
JP2000506204A (ja) 2000-05-23
AU2097097A (en) 1997-09-22
ATE211157T1 (de) 2002-01-15
DE69709320T2 (de) 2002-07-18
FI105040B (fi) 2000-05-31
EP0885261B1 (fr) 2001-12-19

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